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CHAPTER 3  ERYTHROCYTE MATURATION   27

                                         ORTHOCHROMIC NORMOBLAST
                                             Orthochromic Erythroblast
                                                   Metarubricyte

                                                                                     Cytoplasm











                                                                 Nucleus
                                                                 B
                       A                                   FIGURE 3–8B  Schematic of orthochromic
               FIGURE 3–8A  Orthochromic normoblast. The   normoblast.
               gray-blue color of the cytoplasm is becoming
               salmon as more hemoglobin is produced.




               SIZE:  8-10 mm
               NUCLEUS:  Round
               Nucleoli:  0
               Chromatin:  Fully condensed
               CYTOPLASM:  More pink or salmon than blue
               N/C RATIO:  0.5:1
               REFERENCE INTERVAL:
               Bone Marrow:  5% to 10%
               Peripheral Blood:  0%









                                                             C
                                                           FIGURE 3–8C  Electron micrograph of orthochro-
                                                           mic normoblast (320,125).
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